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Glencoe Math: Course 2, Volume 1 View details

2. Percent and Estimation

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Exercise 2 Page 114

Round each number and multiply.

About 400

Practice makes perfect

We want to estimate 79 % of 489. Let's start by rounding each number. rcl 79 % & ≈ & 80 % [0.3em] 489 & ≈ & 500 Now we multiply 80 % by 500 to get an estimation. First, we write the percent as a fraction.

80 %* 500

▼

Write the percent as a fraction

WriteAsFrac

Write as a fraction

80/100 * 500

ReduceFrac

a/b=.a /20./.b /20.

80÷ 20/100÷ 20 * 500

CalcQuot

Calculate quotient

4/5 * 500